Released later in the GameCube's lifecycle, 1.02 is the definitive "patched" version. It did not drastically alter character balance, but it did two critical things:

Crucially, NTSC 1.02 retains the "NTSC Bonuses" – higher hit-stun and stronger kill moves on characters like Fox, Falco, Marth, and Sheik. PAL versions later nerfed these characters, making NTSC 1.02 the preferred "high-octane" competitive experience.

The stability of NTSC 1.02 has made it the bedrock for the modding community. Using tools like DAT Texture Wizard or MCM, you can inject custom skins, stages, and soundtracks into a COPY of the 1.02 ISO.

Popular mods that require NTSC 1.02:

Warning: Never use a modded ISO for online Slippi ranked play—it will desync and get you flagged. Keep your vanilla 1.02 ISO for netplay and a separate modded copy for solo training.

Modern Melee has experienced a renaissance thanks to Slippi (by Fizzi). This mod of the Dolphin emulator adds GGPO-style rollback netcode to a 2001 game.

Slippi only works with the NTSC 1.02 ISO.

Here is why:

Pro Tip: Even if you own a PAL disc physically, to play online, you must source the NTSC 1.02 ISO.